Senior Software Engineer
Ruby on Rails Developer & Healthcare AI Engineer
15+ years building SaaS platforms, LLM integrations, and voice AI systems. Available as a fractional software engineer or Rails consultant for your next project.
Senior Software Engineer
Hire a Ruby on Rails Developer & AI Engineer, On-Demand
Ship production-ready features faster. From Ruby on Rails API development to custom LLM integrations — get a contract software engineer without the overhead of a full-time hire. SaaS development services you can pause or cancel anytime.
Companies I've worked with
Recommendations
"Newton is an avid learner - he was able to dive into one of our more complex projects and begin contributing right away. He's easy to approach, helpful and very knowledgeable in the ruby domain."
What I Do
Services
Backend Engineering
Scalable Ruby on Rails API development, microservices architecture, and robust backend systems. Available as a freelance Rails developer or fractional software engineer for contract engagements.
AI & Voice Systems
LLM integration services, voice AI integration, and conversational pipelines — from speech-to-text to text-to-speech. Specializing as a healthcare AI developer for enterprise and clinical applications.
SaaS Development
End-to-end SaaS development services — from database design and billing to real-time features. Hire a Rails SaaS developer for production-grade product builds.
Pricing
Service Plans
Access senior-level engineering on demand. Scale your development without the overhead of a full-time hire. Pause or cancel anytime.
Standard
Perfect for getting started with dedicated engineering support.
- One request at a time
- Average 48-hour delivery
- Unlimited revisions
- Ruby on Rails & backend
- Frontend & API development
- Async communication
- Pause or cancel anytime
Pro
For teams that need dedicated senior engineering on an ongoing basis.
- Two requests at a time
- Average 48-hour delivery
- Unlimited revisions
- Full-stack development
- AI & voice integrations
- Architecture & code reviews
- Direct Slack/video access
- Pause or cancel anytime
Custom
Tailored solutions for enterprise needs. Let's discuss your requirements.
- Custom request volume
- Priority delivery
- Unlimited revisions
- Team embedding option
- Dedicated Slack channel
- Weekly strategy calls
- Custom contract terms
- Full-stack + AI/ML scope
Not sure which plan fits? Book a 15-minute discovery call to discuss your needs.
Career
Work
Organizations I've partnered with as a software engineer, contributing to real products, production systems, and long-term technical foundations.
Action Network
CurrentCore Ruby on Rails developer and backend engineer on Action Builder, a new organizing CRM product. Designed and implemented GraphQL schema powering relationship mapping, network visualization, and organizer workflows as a contract software engineer.
Wendi
Led development of a healthcare AI voice assistant platform as a contract software engineer. Built automated patient intake, insurance verification, and multichannel conversations using LLM integration services. Architected end-to-end patient workflow engine and real-time conversational AI pipelines.
HuntClub
Developed and shipped features for a talent-matching platform used by thousands of recruiters and hiring managers. Built full-stack features improving recruiter workflows and candidate pipeline management.
The Neat Company
Built and maintained backend microservices for Neat's core platform, led a 3-month Rails upgrade across multiple major versions on a legacy application, and coordinated development with other engineers to modernize and support the company's backend services.
CrazyEgg
Re-architected signup flow and ran 12 A/B tests, lifting conversion rates. Integrated Elasticsearch into analytics dashboard, cutting load time from 4s to 800ms. Built Shopify Kit Skills integration increasing retention rates.
Envato
Built and improved a managed WordPress hosting platform with multi-service architecture. Designed and implemented automated WordPress backup system for thousands of hosted sites.
Pressed
Founding engineer on a greenfield WordPress hosting platform. Built the entire stack from scratch using Ruby on Rails on AWS, including site provisioning, DNS configuration, and SSL management.
ReferralCandy
Shipped product features and streamlined e-commerce platform integrations for a referral marketing SaaS serving thousands of merchants.
Site5
Built internal CRM and client-facing management tools, a white-label managed WordPress product, and custom automation tooling for staff operations.
WWWH
Built internal CRM and client-facing management tools, a white-label managed WordPress product, and custom automation tooling for staff operations.
Critsend
Built a next-generation email deliverability platform in Python and maintained a distributed transactional email service handling high-volume sends. Developed a server reputation monitoring module (blacklist tracker) and a billing application for the new product line.
Side Projects
Projects
Bootstrapped side projects built end-to-end — from concept to production — driven by real problems and long-term curiosity.
Chatified
personal ActiveAI Voice & Messaging Platform with multi-channel support and LLM integration for Businesses.
MailMachine
personal ActiveAI-Powered Email Triage & Automation. Email marketing platform with automation, analytics, and deliverability tools.
Maior Desconto
personal ClosedGroup-buying marketplace in Brazil with $700K+ sales, 41K+ users, and 17K paying customers. Built with Ruby on Rails.
Mailtrack
personal ClosedEmail marketing platform with campaign automation and analytics.
Kivu
personal ClosedSimple e-commerce platform for small businesses and individuals.
Impact
Results That Matter
$700K+
Revenue from bootstrapped marketplace
Maior Desconto
100K+
Students monitored in engagement system
State Gov
17K
Paying customers on e-commerce platform
Maior Desconto
5%
Increase retention via Shopify integration
CrazyEgg
AI
Real-time conversational voice pipelines
Wendi
30K
Monthly payouts processed
State Gov
15+
Years of Experience
Building production systems
10+
Companies
From startups to enterprises
100K+
Users Served
Across platforms built
45
Countries Visited
Global perspective
About
Newton Garcia
Ruby on Rails developer and contract software engineer with 15+ years of experience. Most recently worked as a healthcare AI developer, leading the development of a voice AI integration platform for patient intake and clinical workflows. Built the platform from scratch, including LLM integration services, backend systems, and connections to EHR-related tools.
Available as a freelance Rails developer or fractional software engineer. Background across SaaS development, e-commerce, and cloud platforms, with a strong focus on Ruby on Rails consulting, API development, and production reliability.
Founded two companies — including a Rails SaaS marketplace that generated over $700K in sales — and contributed to open-source projects like graphql-ruby.
Location
Goiania, Brazil
Languages
Portuguese, English, Spanish
Traveled
45 countries →Status
Available
Stack
Technical Skills
Languages
01Backend & APIs
02Frontend
03Data & Search
04Infrastructure
05Observability
06AI & Voice
07Contact
Let's build
something great.
I'm always open to discussing interesting projects and future partnerships